Diatomite

Properties13.9.14--硅藻土2

Diatomaceous color is always the white, gray, gray and light beige, with exquisite, loose, qualitative light, porous, hygroscopicity and permeability properties. The diatoms have many different shapes, such as disc, acicular, tubular, pinnate, etc. The loose density of diatomaceous is 0.3 0.5 g/cm3, mohs hardness is 1 ~ 1.5, the porosity is 80-90%.It can absorb 1.5-4 times water of its own weight and it is a poor conductor of heat, electricity, sound, melting point 1650-1750 ° C.It also has the feature of high chemical stability.in addition to the soluble in hydrofluoric acid, insoluble in any acid, but soluble in alkali solution.

Sources

In the United States, large deposits of diatomite are found in California, Nevada, Washington and Oregon. Of these states, California and Nevada produce the largest amount of diatomite. Significant producers of diatomite worldwide include France, China, Denmark, Russia, and Algeria. Diatomite resources worldwide will meet demand for the foreseeable future. However, new deposits that can be economically mined need to be identified.The United States produces much of its own diatomite material. Still, some is imported from France, Mexico, and other nations.

Application13.9.14--硅藻土1

Because of its porosity, diatomite has been used extensively as a filter for a variety of purposes. It is used to filter impurities out of everything from beer and wine to oils and greases. Similarly, diatomite is used to filter impurities from water to produce drinkable (potable) water in public water systems. In this situation, the diatomite removes bacteria and protozoa.

The oldest use of diatomite is as a very mild abrasive and for this purpose has been used in toothpaste and metal polishes.It is also used in paper, paint, brick, tile, ceramics, plastics, soaps, detergents and other products as a filler. A filler is a substance that increases the volume of a product and/or fills in space.Diatomite has also found value as an insulating material in high-temperature mechanisms like furnaces and boilers. It has also proven effective as a sound insulator.

Formation

A diatom is an organism that is a member of the phylum of algae called Bacillariophyta. There are about 60,000 species of these algae presently known. Experts estimate that there are more likely 600,000 to 6,000,000 species in totall.

Diatoms are single-celled (unicellular) organisms that live as individuals or in groups called colonies. They exist in all the waters of the Earth, both salt and fresh. They form shells made out of silica (the mineral name of this silica is opal) which they extract from the water. As can be seen in these pictures, their microscopic shells are very intricate and beautiful and have rightly been called “the jewels of the sea.” Diatoms are very abundant and provide food for many aquatic animals.

When diatoms die, their silica shells accumulate on the floor of the body of water in which they lived. Thick layers of these diatom shells have been fossilized (that is, preserved) in the rock record. Such layers, or beds, of diatoms are called diatomaceous earth, or diatomite. Diatomaceous earth is white to cream color. It is very porous which makes it useful in a number of filtering applications.

13.9.14--硅藻土0

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